Geomorphic characteristics of the Siming Mountain (Zhejiang, China) based on ASTER-GDEM data analysis
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摘要: 基于ASTER-GDEM数据，运用ArcGIS空间分析功能，通过地势起伏度、条带分析及面积-高程积分三种方法，探讨了浙江东部四明山山地地貌的形态特征.结果表明，四明山由于受断裂构造控制的影响，主体呈NE-SW向展布，中山、低山、丘陵和山麓平原的面积分别占0.6%、16.2%、32.7%和50.5%，山地起伏度较小（平均约81 m）.条带分析表明，山顶残存有多处面积大小不等的古夷平面，它们的高程与玄武岩台地的高程基本一致，南部高出北部约300 m.山地各子流域的面积-高程积分分析表明，HI值在0~0.35、0.35~0.45和0.45~0.60区间段分别占47.31%、30.58%和22.11%，分别对应老年期、壮年（偏老）期和壮年期的地貌发育阶段.山地目前主要受外力剥蚀的影响.
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关键词:
- ASTER-GDEM数据 /
- 面积-高程积分 /
- 地貌形态特征 /
- 四明山
Abstract: Based on ASTER-GDEM data, the geomorphic characteristics of the Siming Mountain (Zhejiang, China) are analyzed using ArcGIS. Parameters describing local relief, the Swath profile and Hypsometric Integral (HI) are applied. The results show that the Siming Mountain of NE-SW is controlled by fault structures. Area occupied by mid-elevation mountain, low-elevation mountain, hill and foothill is 0.6%, 16.2%, 32.7%, and 50.5% respectively; the mid-and low-elevation mountain have a low amplitude of relief (about 81 m). Swath profile analysis shows that the top of the Siming Mountain exhibits remnants of planation surface. When the planation surface was formed, the northeast tectonic activity was resurrected, which caused the basalt to cover it. The results show that the elevation of planation surface is close to the basalt elevation, whereby the southern parts of the mountain are higher by about 300 m than the north. The Hypsometric Integral analysis of each sub-basin reveals HI values are 0-0.35, 0.35-0.45 and 0.45-0.60, accounting for 47.31%, 30.58% and 22.11%. In this paper, the geomorphological features of the study area are simply divided by the HI value. It is found that the HI values in the study area are less than 0.6, and the landforms in the mature stage are subdivided according to elevation distribution in the EP chart, which are the older stage and the typical mature stage. The rest is corresponding to the old age of the landform, which indicates that the study area is now dominated by external force denudation.-
Key words:
- ASTER-GDEM data /
- hypsometric integral /
- geomorphic characteristics /
- Siming Mountain
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图 1 研究区位置及构造轮廓图[16]
注: F1昌化-普陀大断裂; F2孝丰-三门湾大断裂; F3丽水-余姚深断裂; F4鹤溪-奉化大断裂
Fig. 1 Location map of study area with basalt, faults and the main divide
图 5 研究区的子流域HC和EP图
Fig. 5 The HC and EP figures of sub-drainage basins in the study area
表 1 研究区高程统计表
Tab. 1 Statistics of altitude of the study area
高程/m 百分比 累计百分比 面积/km2 累计面积/km2 100~200 17.72% 50.53% 480.71 1 371.09 200~300 13.71% 64.24% 372.06 1 743.14 300~400 10.41% 74.65% 282.51 2 025.65 400~500 8.59% 83.24% 233.12 2 258.78 500~600 6.90% 90.14% 187.24 2 446.01 600~700 4.80% 94.94% 130.36 2 576.37 700~800 2.90% 97.85% 78.72 2 655.09 800~900 0.83% 98.67% 22.47 2 677.56 900~1 000 0.73% 99.40% 19.67 2 697.23 $>1 000$ 0.60% 100.00% 16.34 2 713.57 
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